OmniGraffle is a powerful, yet easy to use diagramming and drawing tool.

Not in the Top 100 in 2013

Website Cost Availability
OmniGraffle Commercial – Free trial Download
2013 2012 2011 2010 2009 2008 2007
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Comments from some of those who selected OmniGraffle as one of their Top Tools 

diagramming is the other way I think out loud, and I’m regularly getting my mind around things by diagramming, Clark Quinn, 2014

“brilliant for diagramming. I’m visual/conceptual and it works the way I want and makes my output look good (I went back and recreated old diagrams just because it was so fun; when’s the last time you said that about productivity software?)”  Clark Quinn, 2013
“OmniGroup’s diagramming software is for much more than drawing diagrams. It’s useful for doing concept maps, outlining chapters in a book, illustrating statements and proofs of theorems — I even used it to redesign my kids’ playroom at home. Better than a paint program and way simpler than something like Adobe Illustrator.”  Robert Talbert